I got 9.75 hope it's right
Answer:
2520
Step-by-step explanation:
LCM(4, 7, 8, 9, 10, 12) = 2520
10+2(x)=5(x-7)
10+2(x)=5(x)-35
35+10=5(x)-2(x)
45=3(x)
45/3=x
x=15
For 6 hours charges $330
for 9 hours charges x
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x = 9*330/6 = 495 so choice C. is right
The diameter is twice as big as the radius
